[Gravy]

It dumps heat energy in the housing though, which would require heavier duty metal used there then in the exhaust beyond that point. But the heat i know bears no factor on the spooling of the turbo, but when it expands not only will it loose heat, but also some kinetic energy as well with the larger piping. That would explain some of the cracks, and maybe a less then ideal design by mitsu, but i don't' know enough to comment on that.

I will be using the stock piping, just have to weld an adapter plate onto the stock manifold and rock that out with the turbo on the adapter plate, can be had for about $10 from a few different places. Stock ones actually have run better with the Td05 turbo's on the stealths, they flow well enough for the 19t's some people run, and have even seen some guys with twin 20g's using the stock manifold with adapter plates, and plenty of extra room to fit them. Seen a few people say the after market tubular manifolds with the td04 flange of them say it actually hurts the spool up giving the car a tad more lag but still due to the turbo, fading in the higher rpm ranges is still there.

The idea behind this whole post was to figure out if the tubular, larger diameter, pipes would give me a better "kick" so to say then the stock one would. The size between the two isn't that much, and wouldn't be a huge deal but for an extra $200 i would still have to weld it up, but was wondering if it would be worth the trouble because i'll already have a slight disadvantage on the spool with only having 1.5l of displacement pushing the turbo instead of the 2.0(or more) that the td05 is use to seeing.

Also wanted to make sense of the reasoning, and not just read, "It will do this." and not know why it's doing it.

Thanks for all the responses so far.